kid who had known that his father was a sperm donor, brilliant kid, who, at age 15, did some snooping, did some genetic genealogy, and ended up telephoning a guy and ended up saying, hi, i think you're my dad. the guy had been a sperm donor under a condition of anonymity. he didn't want to ever be known or contacted. without reaching any kind of confidentiality, one smart kid, using publicly available data, was able to trace that down. if we get whole genome sequencing, we may learn secrets we may not want to know. if two sibs are, in fact, half genetically similar, that says something about whether they actually genuinely shared the same genetic parents or not. so that's another area of privacy involving family relationships that i think we have to at least think about when we consider genetic privacy.